anti freeze

IanC · Oct 2, 2012

I used to have a chart that gave you the ammount of pure anti freeze to ADD to an existing system to lower the freeze point to the desired level. Example 20 quart system at -10 degrees, add X quarts to lower to -34 degrees. I would like to find one again. Yes I know I should really flush and refill, but that's not in the cards right now. I've spent a couple hours searching the web and haven't come up with one yet. Sorry for long post.

FBH44 · Oct 2, 2012

Look on the back of any anti-freeze container.

IanC · Oct 2, 2012

That gives the ammount to mix for a fresh fill, not ADDING to existing mix/fill. Read my example.

mite-help · Oct 2, 2012

it used to be on the back of the gallon jug if it was a major name brand. pretty much says 50/50 mix now i believe,which is best, but i used chart myself before to treat stuff not in use

mite-help · Oct 2, 2012

ok--read your question again---nope, won't find that on the jug--kinda know what you are talking about tho,--think is was involved with the old style float tester? seems like once i had on with this info with it--good luck

teddy52food · Oct 2, 2012

Talk to an algebra teacher. We used to do those problems in high school. But that was over 50 years ago & I forgot it by now.

BCnT · Oct 2, 2012

a coolant hydrometer is the only sure test...without that,just top off with pure AF...you can run up to 80% AF in the mix...needs some water or will slush up.

FBH44 · Oct 2, 2012

Ian - Yeah, I see what you"re saying. I think a person can alomst figure it out. BING or GOOGLE search an antifreeze chart, and you will see something like this;
20 quart system
You got -10F 8 quarts antifreeze
You want -34F 10 quarts antifreeze
In other words, there"s 2 quarts difference. However, if you drain out 2 quarts of mix, you will drain some existing antifreeze too.
So SWAG indicates drain 3 quarts of mix, add 3 quarts pure antifreeze, ya probably be good.

Paul from MI · Oct 2, 2012

To solve the problem you have to know the total capacity of your cooling system and what the percent antifreeze currently is(you can find this from the chart on the container) using the freezing point of the mixture from your hydrometer.
Assume you desire a 50% mix and have a 10 gallon system that currently has 30% antifreeze or 3 gallons of antifreeze and 7 gallons of water in it. Now you drain 3 gallons of the mixture out and add 3 gallons of antifreeze, so you now have 7 gallons mixture at 30% or 2.1 gallons of antifreeze and 4.9 gallons of water, plus 3 gallons of antifreeze you just added. So you now have 4.9 gallons of water and 5.1 gallons of antifreeze. I know I could write it out algebraically, but practically this is how the process works. Better a little heavy on the antifreeze anyway.

anti freeze

IanC

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FBH44

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IanC

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mite-help

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mite-help

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teddy52food

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BCnT

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FBH44

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Paul from MI

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